Copy/split csv-data-manipulation as a lib.
This commit is contained in:
@@@No user configured@@@
parent
e7c1b7d973
commit
ab8879aab7
5 changed files with 270 additions and 244 deletions
2
.gitignore
vendored
2
.gitignore
vendored
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@ -1,2 +1,4 @@
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bin/*
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tmp/*
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deps/
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*.o
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5
Makefile
5
Makefile
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@ -1,11 +1,12 @@
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SRC = $(wildcard src/*.c)
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DEPS = $(wildcard deps/**/*.c)
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OBJS = $(patsubst %.c,%.o,$(DEPS))
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LIBS = $(wildcard lib/**/*.c)
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OBJS = $(patsubst %.c,%.o,$(DEPS) $(LIBS))
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BINS = $(patsubst src/%,bin/%,$(patsubst %.c,%,$(SRC)))
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# CFLAGS = -std=c99 -Ideps -Wall -Wno-unused-function -U__STRICT_ANSI__
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CFLAGS = -ggdb -std=c99 -Ideps -Wall -Wno-unused-function -pedantic
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CFLAGS = -ggdb -std=c99 -Ideps -Ilib -Wall -Wno-unused-function -pedantic
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all: $(BINS)
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233
lib/libcsv/libcsv.c
Normal file
233
lib/libcsv/libcsv.c
Normal file
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@ -0,0 +1,233 @@
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#include "libcsv.h"
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/**
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* How to read a CSV file ?
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*/
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/**
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* Utility function to trim whitespaces from left & right of a string
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*/
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int trim(char ** str) {
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int trimmed;
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int n;
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int len;
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len = strlen(*str);
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n = len - 1;
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/* from right */
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while((n>=0) && isspace((*str)[n])) {
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(*str)[n] = '\0';
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trimmed += 1;
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n--;
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}
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/* from left */
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n = 0;
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while((n < len) && (isspace((*str)[0]))) {
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(*str)[0] = '\0';
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*str = (*str)+1;
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trimmed += 1;
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n++;
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}
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return trimmed;
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}
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/**
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* De-allocate csv structure
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*/
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int csv_destroy(CSV * csv) {
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if (csv == NULL) { return 0; }
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if (csv->table != NULL) { free(csv->table); }
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if (csv->delim != NULL) { free(csv->delim); }
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free(csv);
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return 0;
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}
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/**
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* Allocate memory for a CSV structure
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*/
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CSV * csv_create(unsigned int cols, unsigned int rows) {
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CSV * csv;
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csv = malloc(sizeof(CSV));
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csv->rows = rows;
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csv->cols = cols;
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csv->delim = strdup(",");
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csv->table = malloc(sizeof(char *) * cols * rows);
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if (csv->table == NULL) { goto error; }
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memset(csv->table, 0, sizeof(char *) * cols * rows);
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return csv;
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error:
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csv_destroy(csv);
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return NULL;
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}
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/**
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* Get value in CSV table at COL, ROW
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*/
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char * csv_get(CSV * csv, unsigned int col, unsigned int row) {
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unsigned int idx;
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idx = col + (row * csv->cols);
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return csv->table[idx];
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}
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/**
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* Set value in CSV table at COL, ROW
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*/
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int csv_set(CSV * csv, unsigned int col, unsigned int row, char * value) {
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unsigned int idx;
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idx = col + (row * csv->cols);
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csv->table[idx] = value;
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return 0;
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}
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void csv_display(CSV * csv) {
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int row, col;
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char * content;
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if ((csv->rows == 0) || (csv->cols==0)) {
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printf("[Empty table]\n");
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return ;
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}
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printf("\n[Table cols=%d rows=%d]\n", csv->cols, csv->rows);
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for (row=0; row<csv->rows; row++) {
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printf("[|");
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for (col=0; col<csv->cols; col++) {
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content = csv_get(csv, col, row);
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printf("%s\t|", content);
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}
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printf("]\n");
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}
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printf("\n");
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}
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/**
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* Resize CSV table
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*/
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int csv_resize(CSV * old_csv, unsigned int new_cols, unsigned int new_rows) {
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unsigned int cur_col,
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cur_row,
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max_cols,
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max_rows;
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CSV * new_csv;
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char * content;
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bool in_old, in_new;
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/* Build a new (fake) csv */
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new_csv = csv_create(new_cols, new_rows);
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if (new_csv == NULL) { goto error; }
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new_csv->rows = new_rows;
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new_csv->cols = new_cols;
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max_cols = (new_cols > old_csv->cols)? new_cols : old_csv->cols;
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max_rows = (new_rows > old_csv->rows)? new_rows : old_csv->rows;
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for (cur_col=0; cur_col<max_cols; cur_col++) {
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for (cur_row=0; cur_row<max_rows; cur_row++) {
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in_old = (cur_col < old_csv->cols) && (cur_row < old_csv->rows);
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in_new = (cur_col < new_csv->cols) && (cur_row < new_csv->rows);
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if (in_old && in_new) {
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/* re-link data */
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content = csv_get(old_csv, cur_col, cur_row);
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csv_set(new_csv, cur_col, cur_row, content);
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} else if (in_old) {
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/* destroy data */
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content = csv_get(old_csv, cur_col, cur_row);
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free(content);
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} else { /* skip */ }
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}
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}
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/* on rows */
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free(old_csv->table);
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old_csv->rows = new_rows;
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old_csv->cols = new_cols;
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old_csv->table = new_csv->table;
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new_csv->table = NULL;
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csv_destroy(new_csv);
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return 0;
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error:
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printf("Unable to resize CSV table: error %d - %s\n", errno, strerror(errno));
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return -1;
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}
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/**
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* Open CSV file and load its content into provided CSV structure
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**/
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int csv_open(CSV * csv, char * filename) {
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FILE * fp;
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unsigned int m_rows;
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unsigned int m_cols, cols;
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char line[2048];
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char * lineptr;
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char * token;
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fp = fopen(filename, "r");
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if (fp == NULL) { goto error; }
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m_rows = 0;
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m_cols = 0;
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while(fgets(line, sizeof(line), fp) != NULL) {
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m_rows += 1;
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cols = 0;
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lineptr = line;
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while ((token = strtok(lineptr, csv->delim)) != NULL) {
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lineptr = NULL;
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trim(&token);
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cols += 1;
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if (cols > m_cols) { m_cols = cols; }
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csv_resize(csv, m_cols, m_rows);
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csv_set(csv, cols-1, m_rows-1, strdup(token));
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}
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}
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fclose(fp);
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csv->rows = m_rows;
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csv->cols = m_cols;
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return 0;
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error:
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fclose(fp);
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printf("Unable to open %s for reading.", filename);
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return -1;
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}
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/**
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* Open CSV file and save CSV structure content into it
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**/
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int csv_save(CSV * csv, char * filename) {
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FILE * fp;
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int row, col;
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char * content;
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fp = fopen(filename, "w");
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for (row=0; row<csv->rows; row++) {
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for (col=0; col<csv->cols; col++) {
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content = csv_get(csv, col, row);
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fprintf(fp, "%s%s", content,
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((col == csv->cols-1) ? "" : csv->delim) );
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}
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fprintf(fp, "\n");
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}
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fclose(fp);
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return 0;
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}
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28
lib/libcsv/libcsv.h
Normal file
28
lib/libcsv/libcsv.h
Normal file
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#define _GNU_SOURCE
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#define bool int
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#include <stdio.h>
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#include <stdlib.h> /* malloc...*/
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#include <string.h> /* strtok...*/
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#include <ctype.h>
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#include <errno.h>
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typedef struct {
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char * delim;
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unsigned int rows;
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unsigned int cols;
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char ** table;
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} CSV;
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/* libcsv.c */
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int trim(char **str);
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int csv_destroy(CSV *csv);
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CSV *csv_create(unsigned int cols, unsigned int rows);
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char *csv_get(CSV *csv, unsigned int col, unsigned int row);
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int csv_set(CSV *csv, unsigned int col, unsigned int row, char *value);
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void csv_display(CSV *csv);
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int csv_resize(CSV *old_csv, unsigned int new_cols, unsigned int new_rows);
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int csv_open(CSV *csv, char *filename);
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int csv_save(CSV *csv, char *filename);
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@ -2,250 +2,11 @@
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#define TITLE "CSV data manipulation"
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#define URL "http://rosettacode.org/wiki/CSV_data_manipulation"
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#define _GNU_SOURCE
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#define bool int
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#include <stdio.h>
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#include <stdlib.h> /* malloc...*/
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#include <string.h> /* strtok...*/
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#include <ctype.h>
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#include <errno.h>
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#include <libcsv/libcsv.h>
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/**
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* How to read a CSV file ?
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* Test
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*/
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typedef struct {
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char * delim;
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unsigned int rows;
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unsigned int cols;
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char ** table;
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} CSV;
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/**
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* Utility function to trim whitespaces from left & right of a string
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*/
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int trim(char ** str) {
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int trimmed;
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int n;
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int len;
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len = strlen(*str);
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n = len - 1;
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/* from right */
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while((n>=0) && isspace((*str)[n])) {
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(*str)[n] = '\0';
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trimmed += 1;
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n--;
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}
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/* from left */
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n = 0;
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while((n < len) && (isspace((*str)[0]))) {
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(*str)[0] = '\0';
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*str = (*str)+1;
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trimmed += 1;
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n++;
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}
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return trimmed;
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}
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/**
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* De-allocate csv structure
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*/
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int csv_destroy(CSV * csv) {
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if (csv == NULL) { return 0; }
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if (csv->table != NULL) { free(csv->table); }
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if (csv->delim != NULL) { free(csv->delim); }
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free(csv);
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return 0;
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}
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/**
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* Allocate memory for a CSV structure
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*/
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CSV * csv_create(unsigned int cols, unsigned int rows) {
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CSV * csv;
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csv = malloc(sizeof(CSV));
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csv->rows = rows;
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csv->cols = cols;
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csv->delim = strdup(",");
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csv->table = malloc(sizeof(char *) * cols * rows);
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if (csv->table == NULL) { goto error; }
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memset(csv->table, 0, sizeof(char *) * cols * rows);
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return csv;
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error:
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csv_destroy(csv);
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return NULL;
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}
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/**
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* Get value in CSV table at COL, ROW
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*/
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char * csv_get(CSV * csv, unsigned int col, unsigned int row) {
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unsigned int idx;
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idx = col + (row * csv->cols);
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return csv->table[idx];
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}
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/**
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* Set value in CSV table at COL, ROW
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*/
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int csv_set(CSV * csv, unsigned int col, unsigned int row, char * value) {
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unsigned int idx;
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idx = col + (row * csv->cols);
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csv->table[idx] = value;
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return 0;
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}
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void csv_display(CSV * csv) {
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int row, col;
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char * content;
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if ((csv->rows == 0) || (csv->cols==0)) {
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printf("[Empty table]\n");
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return ;
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}
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printf("\n[Table cols=%d rows=%d]\n", csv->cols, csv->rows);
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for (row=0; row<csv->rows; row++) {
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printf("[|");
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for (col=0; col<csv->cols; col++) {
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content = csv_get(csv, col, row);
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printf("%s\t|", content);
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}
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printf("]\n");
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}
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printf("\n");
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}
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/* Resize CSV table
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* - grow columns: on each row, add missing columns cells
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* - grow rows: add now rows, with all columns count
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* - reduce columns: remove columns from right
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* - reduce lines: remove columns from the end
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*/
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int csv_resize(CSV * old_csv, unsigned int new_cols, unsigned int new_rows) {
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unsigned int cur_col,
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cur_row,
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max_cols,
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max_rows;
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CSV * new_csv;
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char * content;
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bool in_old, in_new;
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/* Build a new (fake) csv */
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new_csv = csv_create(new_cols, new_rows);
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if (new_csv == NULL) { goto error; }
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new_csv->rows = new_rows;
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new_csv->cols = new_cols;
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max_cols = (new_cols > old_csv->cols)? new_cols : old_csv->cols;
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max_rows = (new_rows > old_csv->rows)? new_rows : old_csv->rows;
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for (cur_col=0; cur_col<max_cols; cur_col++) {
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for (cur_row=0; cur_row<max_rows; cur_row++) {
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in_old = (cur_col < old_csv->cols) && (cur_row < old_csv->rows);
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in_new = (cur_col < new_csv->cols) && (cur_row < new_csv->rows);
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if (in_old && in_new) {
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/* re-link data */
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content = csv_get(old_csv, cur_col, cur_row);
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csv_set(new_csv, cur_col, cur_row, content);
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} else if (in_old) {
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/* destroy data */
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content = csv_get(old_csv, cur_col, cur_row);
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free(content);
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} else { /* skip */ }
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}
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}
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/* on rows */
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free(old_csv->table);
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old_csv->rows = new_rows;
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old_csv->cols = new_cols;
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old_csv->table = new_csv->table;
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new_csv->table = NULL;
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csv_destroy(new_csv);
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return 0;
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error:
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printf("Unable to resize CSV table: error %d - %s\n", errno, strerror(errno));
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return -1;
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}
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/* , char delim='\t' */
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int csv_open(CSV * csv, char * filename) {
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FILE * fp;
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unsigned int m_rows;
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unsigned int m_cols, cols;
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char line[2048];
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char * lineptr;
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char * token;
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fp = fopen(filename, "r");
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if (fp == NULL) { goto error; }
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m_rows = 0;
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m_cols = 0;
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while(fgets(line, sizeof(line), fp) != NULL) {
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m_rows += 1;
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cols = 0;
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lineptr = line;
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while ((token = strtok(lineptr, csv->delim)) != NULL) {
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lineptr = NULL;
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trim(&token);
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cols += 1;
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if (cols > m_cols) { m_cols = cols; }
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csv_resize(csv, m_cols, m_rows);
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csv_set(csv, cols-1, m_rows-1, strdup(token));
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}
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}
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fclose(fp);
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csv->rows = m_rows;
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csv->cols = m_cols;
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return 0;
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error:
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fclose(fp);
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printf("Unable to open %s for reading.", filename);
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return -1;
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}
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int csv_save(CSV * csv, char * filename) {
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FILE * fp;
|
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int row, col;
|
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char * content;
|
||||
|
||||
fp = fopen(filename, "w");
|
||||
for (row=0; row<csv->rows; row++) {
|
||||
for (col=0; col<csv->cols; col++) {
|
||||
content = csv_get(csv, col, row);
|
||||
fprintf(fp, "%s%s", content,
|
||||
((col == csv->cols-1) ? "" : csv->delim) );
|
||||
}
|
||||
fprintf(fp, "\n");
|
||||
}
|
||||
|
||||
fclose(fp);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int main(int argc, char ** argv) {
|
||||
CSV * csv;
|
||||
|
||||
|
|
@ -262,8 +23,9 @@ int main(int argc, char ** argv) {
|
|||
csv_set(csv, 4, 4, "400");
|
||||
csv_display(csv);
|
||||
|
||||
csv_save(csv, "tmp/csv-data-manupulation.out.csv");
|
||||
csv_save(csv, "tmp/csv-data-manipulation.result.csv");
|
||||
csv_destroy(csv);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue